export function loadMap(key, plugins, v = 'version') {
  return new Promise(function(resolve, reject) {
    if (typeof AMap !== 'undefined') {
      // eslint-disable-next-line no-undef
      resolve(AMap)
      return true
    }
    window.onCallback = function() {
      // eslint-disable-next-line no-undef
      resolve(AMap)
    }
    const script = document.createElement('script')
    script.type = 'text/javascript'
    script.src = `https://webapi.amap.com/maps?v=${v}&key=${key}&plugin=${plugins}&callback=onCallback`
    script.onerror = reject
    document.head.appendChild(script)
  })
}
export const groupBy = (arr, func) =>
  arr.map(typeof func === 'function' ? func : val => val[func])
    .reduce((acc, val, i) => { acc[val] = (acc[val] || []).concat(arr[i]); return acc }, {})

export function randomString(len) {
  len = len || 32
  const $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678' /** **默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
  const maxPos = $chars.length
  let pwd = ''
  for (let i = 0; i < len; i++) {
    pwd += $chars.charAt(Math.floor(Math.random() * maxPos))
  }
  return pwd
}
